Dana
Calum went through a stubborn stage at 5 months and I think a lot of LO's do. I agree with everything Sarah has suggested, also try a 5 - 10 min break.
I know it is very frustrating and I also went through a stage of walking around with him.
Is she hungry between her feeds? It sounds like your on a 4hr EASY so thats not the problem
if you think she may be teething rub some teething gel on her gums prior to offering the bottle.
If it is new formula you have given her could it be an intolerance?
Is your LO constipated?
Is your LO currently suffering from any illness or medical condition?
Here is more info on teething.....
Does your LO display any of the following symptoms;
* restlessness, irritability and disturbed sleep patterns
* sore, red gums
* flushed cheeks
* loss of appetite
* a slight rise in temperature (but not above 39oC, which indicates a fever)
* dribbling (which may cause a rash or sore, chapped skin on the chin)
* a sudden desire to chew anything they can lay their hands on!
* an urge to bite. This should not be perceived as a sign of aggression or anger, more of a means to ease the pain.
http://www.teething-babies.co.uk/easing-teething/index.htmlYour LO does not necessarily need to have any teeth showing for her to be teeting, the process of the teeth pushing up through the gums is very sore, it makes their gums harden and they bite on everything.
HTH's